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C/C++ for "XEvent = {}" promise to zero initialize only the first member of the
union. The tails of larger member can be uninitialized.

Detected with -ftrivial-auto-var-init=pattern.

XEvent member sizes on x86_64
40 xany
96 xkey
96 xbutton
96 xmotion
104 xcrossing
48 xfocus
64 xexpose
72 xgraphicsexpose
48 xnoexpose
48 xvisibility
72 xcreatewindow
48 xdestroywindow
56 xunmap
56 xmap
48 xmaprequest
72 xreparent
88 xconfigure
56 xgravity
48 xresizerequest
96 xconfigurerequest
56 xcirculate
56 xcirculaterequest
64 xproperty
56 xselectionclear
80 xselectionrequest
72 xselection
56 xcolormap
96 xclient
56 xmapping
40 xerror
72 xkeymap
40 xgeneric
56 xcookie
192 pad

Bug: 977230

Change-Id: I7838e5f68b6320e067f9c446222a38fdcd35bdd8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1842505Reviewed-by: Thomas Anderson <thomasanderson@chromium.org>
Reviewed-by: Sadrul Chowdhury <sadrul@chromium.org>
Commit-Queue: Vitaly Buka <vitalybuka@chromium.org>
Cr-Commit-Position: refs/heads/master@{#703384}